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File Extensions Beginning with "U"
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| .u |
Subsampled Raw YUV Image |
| .u |
AU Audio File |
| .u |
Unreal Tournament Class Package |
| .u10 |
UFile 2010 Tax Return |
| .u11 |
UFile 2011 Tax Return |
| .u12 |
UFile 2012 Tax Return |
| .u3d |
Universal 3D File |
| .u3i |
U3 Application Information File |
| .u3p |
U3 Smart Application |
| .uax |
Unreal Audio Package |
| .ub |
Unsigned Byte Audio File |
| .uc |
UnrealScript Class |
| .uc2 |
UltraCompressor 2 Archive |
| .uci |
UFS Explorer Backup File |
| .ud |
OmniPage User Dictionary |
| .udb |
Dynamics AX User Database File |
| .udf |
Universal Disk Format File |
| .udf |
Excel User Defined Function |
| .ufo |
Ulead File Object |
| .uha |
UHarc Compressed Archive |
| .ui |
User Interface File |
| .uibak |
UltraISO Backup Disk Image |
| .uif |
Universal Image Format Disc Image |
| .uis |
WindowBlinds User Interface Specification |
| .ukx |
Unreal Animation Package |
| .ulaw |
Raw u-Law Audio File |
| .ulf |
Universal List File |
| .uls |
NetMeeting User Location Service File |
| .ult |
UltraTracker Module |
| .ulw |
u-Law Audio File |
| .ulz |
USBlyzer Data Capture File |
| .uml |
UML Data Object Model |
| .umlclass |
UML Class Model |
| .umod |
Unreal Tournament Module File |
| .umx |
Unreal Music Package |
| .unauth |
SiteMinder Unauthorized Message File |
| .uni |
MikMod UniMOD Module |
| .unity3d |
Unity Web Player File |
| .unk |
Unknown File |
| .unknown |
Unknown File Type |
| .unr |
Unreal Level Map |
| .unx |
Unix Text File |
| .uop |
Ultima Online Patch File |
| .upd |
Program Update Information |
| .upoi |
iGO Points of Interest File |
| .upx |
Ultimate Packer for eXecutables File |
| .url |
Internet Shortcut |
| .urt |
Utah Raster Toolkit File |
| .usa |
Unreal Saved Game File |
| .usf |
Nintendo 64 Music File |
| .usflib |
Nintendo 64 Song Library |
| .usx |
Unreal Static Meshes |
| .ut2 |
Unreal Tournament Map |
| .ut2mod |
Unreal Tournament 2003/2004 Module File |
| .ut3 |
Unreal Tournament 3 Map File |
| .utc |
Bioware Creature File |
| .utf8 |
Unicode UTF8-Encoded Text Document |
| .utx |
Unreal Texture Package |
| .utxt |
Unicode Text File |
| .uu |
Uuencoded File |
| .uud |
UUDecoded File |
| .uue |
Uuencoded File |
| .uvf |
Uncertain Value Format |
| .uvx |
Unreal Tournament 2003 Saved Game |
| .uw |
Unsigned Word Audio File |
| .uwf |
UltraTracker Wave File |
| .uxx |
Unreal Tournament Cache |
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